145771720 has 32 divisors (see below), whose sum is σ = 335617920. Its totient is φ = 56952000.

The previous prime is 145771711. The next prime is 145771741. The reversal of 145771720 is 27177541.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40656 + ... + 44095.

It is an arithmetic number, because the mean of its divisors is an integer number (10488060).

Almost surely, 2^145771720 is an apocalyptic number.

145771720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145771720 is an abundant number, since it is smaller than the sum of its proper divisors (189846200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

145771720 is a wasteful number, since it uses less digits than its factorization.

145771720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84805 (or 84801 counting only the distinct ones).

The product of its (nonzero) digits is 13720, while the sum is 34.

The square root of 145771720 is about 12073.5959846269. The cubic root of 145771720 is about 526.2891613686.

The spelling of 145771720 in words is "one hundred forty-five million, seven hundred seventy-one thousand, seven hundred twenty".